Update README Travis CI badge
Update README Travis CI badge

heitortsergent/KeenClient-iOS,heitortsergent/KeenClient-iOS,keenlabs/KeenClient-iOS,heitortsergent/KeenClient-iOS,heitortsergent/KeenClient-iOS,heitortsergent/KeenClient-iOS,keenlabs/KeenClient-iOS,keenlabs/KeenClient-iOS